Very common,
it is a mutilated stationery piece.
A newspaper wrapper indicia.
I like them, often carry exciting print Postmarks.
(As yours has N.P.B = Newspaper Branch)
Never seen an example that has been punctured before "8" or "S" ?
Not sure of Pmk (Postmark) "Killer" Type,
Probably belongs to the family Numbers #15 or #16
Bib: Stitt Dibden
Your code appears to be "K"
